DE3408786C1

DE3408786C1 - Connecting element for the invisible connection of parts, especially flat parts in the case of furniture

Info

Publication number: DE3408786C1
Application number: DE3408786A
Authority: DE
Inventors: Walter 4520 Melle Fischer
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-03-10
Filing date: 1984-03-10
Publication date: 1985-11-28
Also published as: DD233396A5; ZA851745B

Abstract

In order to improve the swelling-up capability of a connecting element while at the same time increasing the joining effect between the wall of a cylindrical drilled hole and the connecting element, consisting of compressed wood or another compressed material which is statically stable, can be compressed and can swell up, in each case one longitudinal hole is incorporated from both ends, at whose ends one or more continuous transverse hole(s) is or are arranged. Two transverse holes, running at right angles with respect to one another, are advantageously arranged at the end of one longitudinal hole. The holes contribute to improving the swelling-up capability of the connecting element resulting from absorption of the moisture of the adhesive, and permit improved distribution of the adhesive over the entire length of the connecting element. In consequence, a joining effect is achieved whose strength is far greater than that of conventional connections.

Description

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigt F i g. 1 eine Längsansicht eines Verbindungselements; F i g. 2 eine Längsansicht eines Teiles eines Verbindungselements, um 90O gegenüber der Ansicht nach F i g. 1 gedreht; Fig3 eine Stirnansicht eines Verbindungselements und Fig 4 einen Längsschnitt durch ein teilweise in ein zylindrisches Bohrloch eingeführtes Verbindungselement mit schematischer Darstellung des Leimflusses in den Bohrungen. An embodiment of the invention is shown in the drawing and is described in more detail below. It shows F i g. 1 is a longitudinal view of a Connecting element; F i g. 2 shows a longitudinal view of part of a connecting element, by 90O compared to the view according to FIG. 1 rotated; Fig3 is an end view of a Connecting element and FIG. 4 shows a longitudinal section through a partially in a cylindrical Borehole inserted connecting element with a schematic representation of the glue flow in the holes.

Das Verbindungselement 1 besitzt bekannterweise an den Stirnseiten je eine Spitze 5 und auf der Außenfläche beliebige Profilierungen 9. Von den beiden Stirnseiten aus ist je eine Längsbohrung 2 eingebracht, an deren Ende eine Querbohrung 3 angeordnet ist, die in der Ringfräsung 4 beginnt und endet. Sind auf jeder Hälfte des Verbindungselements 1 mehr als eine Ringfräsung 4 angebracht, so verlängert sich die Längsbohrung 2 entsprechend, wobei es ohne weiteres möglich ist, jeder Ringfräsung 4 zwei Querbohrungen 3 zuzuordnen. Bei zwei Ringfräsungen 4 könnten z. B. insgesamt vier Querbohrungen 3 vorhanden sein. In der Praxis hat sich gezeigt, daß zur Herstellung einer ausreichenden Verbundwirkung eine Ringfräsung 4 mit einer Querbohrung 3 ausreicht. The connecting element 1 is known to have on the end faces one point 5 each and any profiling 9 on the outer surface. Of the two End faces each have a longitudinal bore 2, at the end of which a transverse bore 3 is arranged, which begins and ends in the ring milling 4. Are on each half of the connecting element 1 attached more than one milled ring 4, so extended the longitudinal bore 2 accordingly, it is easily possible to each Ring milling 4 to be assigned to two cross bores 3. With two ring millings 4 could z. B. a total of four cross bores 3 may be present. In practice it has been shown that to produce a sufficient composite effect a milled ring 4 with a Cross hole 3 is sufficient.

Die Längsbohrung 2 ist so angesetzt, daß die Spitze 5 angeschnitten wird, so daß sich, wie aus F i g. 3 erkennbar, längs der Spitze zwei scharfkantige Schneiden 10 ergeben. Diese Schneiden 10 tragen zum besseren und problemloseren Zerstören der Leimperlenhülle 7 bei. The longitudinal bore 2 is set so that the tip 5 is cut so that, as shown in FIG. 3 recognizable, two sharp-edged ones along the tip Cutting 10 result. These cutting edges 10 contribute to the better and easier Destroying the glue bead shell 7 at.

Die leere Leimperlenhülle 7 wird, wie in F i g. 4 dargestellt, im wesentlichen durch den äußeren Ringfalz 6 aufgenommen und an die Stirnseite 8 des Bohrlochs angedrückt. Die Leimperlenhülle 7 hindert also nicht die Verteilung des Klebstoffs auf die Außenfläche des Verbindungselements 1. In F i g. 4 ist in schematischer Darstellung der Leimfluß in der Längsbohrung 2 und der Querbohrung 3 dargestellt. Wird das Verbindungselement 1 weiter an die Stirnseite 8 des Bohrloches gedrückt, dann wird ein Teil des aus der Leimperle freigesetzten Klebstoffs über die Bohrungen 2 und 3 und ein weiterer Teil direkt auf die Außenfläche des Verbindungselements 1 geleitet. The empty glue bead shell 7 is, as shown in FIG. 4 shown in taken up essentially by the outer ring fold 6 and attached to the end face 8 of the Pressed the borehole. The glue bead shell 7 does not prevent the distribution of the Adhesive to the outer surface of the connecting element 1. In F i g. 4 is in schematic Representation of the glue flow in the longitudinal bore 2 and the transverse bore 3 are shown. If the connecting element 1 is pressed further against the end face 8 of the borehole, then some of the adhesive released from the glue bead is over the holes 2 and 3 and another part directly onto the outer surface of the connecting element 1 headed.

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Claims

Claims: 1. Connection element for invisible connection of parts, in particular flat parts in furniture, which are in cylindrical bores of the parts to be connected can be introduced, with a symmetrical to the vertical central axis Training and profiling on the outer surface, in which both end faces each are designed to run to a point or each have a tip, consisting of compressed Wood or some other compressed, statically stable, compressible, swellable Material and formed by pressing together a larger cylindrical blank by a predetermined amount at which the outer surface to improve the swellability at several points by cutting, preferably in the form of ring millings, is destroyed, according to patent ... (patent application P 33 38 224.7-16), characterized in that that a longitudinal bore (2) is introduced from each of the two end faces, at which Ends one or more through transverse bore (s) (3) is or are arranged.

2. Connecting element according to claim 1 with milled rings, characterized characterized in that the transverse bores (3) begin in the milled ring (4) and end up.

3. Connecting element according to claim 1 or 2, characterized in that that at the end of a longitudinal bore (2) two transverse bores (3) at right angles to each other are arranged to run.

4. Connecting element according to one of claims 1 to 3, characterized in that that the tip (5) on the front side is cut through the longitudinal bore (2) is.

5. Connecting element according to one of claims 1 to 4, characterized in that that an outer ring fold (6) is arranged on each of the end faces.

The invention relates to a connecting element for invisible connection of parts, in particular flat parts in furniture, which are in cylindrical bores of the parts to be connected can be introduced, with a symmetrical to the vertical central axis Training and profiling on the outer surface, in which both end faces each are designed to run to a point or each have a tip, consisting of compressed Wood or some other compressed, statically stable, compressible, swellable Material and formed by pressing together a larger cylindrical blank by a predetermined amount at which the outer surface to improve the swellability at several points by cutting, preferably in the form of ring millings, is destroyed, according to patent ... (patent application P 33 38 224.7-16).

In such a known connecting element (DE-GM 8330311) the ability to swell is determined by compressing the cylindrical blank Wood or another statically stable swellable material as well as through the Destruction of the outer surface, preferably by cutting ring millings, improved. In the case of a wooden dowel, the end-grain wood is exposed by cutting, the well-known wise not very resistant to moisture penetration is.

When using the known connecting element in connection with Chipboard is after the adhesive has hardened between the connecting element and the chipboard is provided with a tongue and groove connection. The pen is here formed by the material of the chipboard, this tongue of the annular groove of the connecting element is adapted. The spring of the chipboard is created by the swelling of the chipboard as a result of the moisture absorbed by the adhesive. Are particularly advantageous the proposed fasteners in conjunction with a glue bead, in which an adhesive is hermetically enclosed in a breakable envelope, may be used.

The invention is based on the object of a connecting element to design the genus shown so that the swellability with simultaneous Increasing the bond between the wall of the cylindrical borehole and the connecting element is significantly improved.

According to the invention, this object is achieved in that of the two End faces each made of a longitudinal bore is introduced, at the ends of which one or more continuous cross hole (s) is or

are. In an embodiment of the invention, the transverse bores begin and end in the ring millings. It is advantageous to have two cross bores at right angles to one another to be arranged running. The tip present on the front side is expedient cut through the longitudinal hole. In a preferred embodiment is an outer ring fold is arranged on each of the end faces.

The inventive design, the moisture of the adhesive received by a much larger inner surface of the connecting element, whereby faster and more extensive swelling occurs, which occurs after the Adhesive is retained. However, the longitudinal and transverse bores are not only essentially responsible Scope to improve the swelling of the fastener at, but before especially to improve the distribution of the adhesive over the entire length. The adhesive penetrates into the longitudinal bore, which is open on the end faces, and passes through the transverse bores out of the connecting element again at at least two points of a milled ring.

This removes a substantial part of the destroyed glue bead adhesive present in the borehole, which is initially only in front of the Front side is distributed over the length of the connecting element. The faster one and more even distribution of the adhesive contributes significantly to the improvement the composite effect. Those with the connecting element designed according to the invention The connections produced are characterized by extremely high strength which is far higher than the strength of conventional connections.